pls help me i cant do that

I reccomend that unless you're a top level runner top 10-20 you don't need to worry about it, seeing as you don't have a run submitted.

smwspeedruns.com/Donut_Secret_House#:~:text=Stair%20Clip,-The%20stair%20clip&text=Simply%20do%20a%20full%20spinjump%20from%20the%20bottom%20of%20the%20stairs.
This website will have a video and a still image of where you need to be to do the clip.